Pressure cooker



C. NELSON PRESSURE CooKER Dec. 3, 1935.

Filed Oct. 6, 1935 2 Sheets-Sheet l [721/672 z/oz GvfeL NELSON C. NELSONPRESSURE 'cooKER Dec. 3, 1935.

Filed Oct. 6, 1955 2 Sheets-Sheet 2 3 w O IV Q/mw m F VN Puentes Dec. s,193s PRESSURE COOKER Carl Nelson, Eau Claire, Wis., assigner to NationalPressure Cooker Company, Eau Claire, Wis., a corporation of WisconsinApplication October 6, 19.33, Serial No. 692,391 16 claims. (01.2204-55)is inadvertently actuated to release the cover be-v fore the pressurehas been released from the cooker.

A further object is to provide in combination with a pressure cooker andits cover, an annular locking member adapted to engage means on thecover and cooker body to thereby force the cover into sealing engagementwith its seat, and means necessitating that the cover be lifted to apredetermined position before it can be relatively rotated to permit itscomplete removal from the cooker body.

Other objects of the invention reside in the provision of a cooker bodyhaving outwardly pro- 5 jecting means thereon, and a cover for said bodyhaving outwardly projectingl means adapted to overlie the correspondingmeans on the cooker body; in the annular locking member provided forsecuring the cover in sealing engagement with its seat; in the uprightelements provided upon, the

cooker body and positioned to be engaged by means on the cover andthereby limit the relative rotary movement of the cover upon the cookerbody and which elements are also adapted to restrict upward movement of-the cover; in the means provided in connection with the locking meansnecessitating that the cover be lifted to a predetermined positionbefore it can be completely removed from the cooker body; and in thespecific construction of the cover securing means, which comprises anannular locking member of angular cross-section, and having its upperportion adapted to be seated upon the cover and its lower portion beingprovided with inwardly projecting means adapted to engage projectionsupon the cover, when said annular locking member is actuated to securethe cover to the cooker body.

Other objects of the invention will appear from the followingdescription and accompanying drawings and will be pointed out in theannexed claims.

In the accompanying drawings there has been disclosed a structuredesigned to carry out the various objects of the invention, but it is tobeV -understood that the invention is not conned to the exact featuresshown as various changes may be made within the scope of the claimswhich follow.

In the drawings:

Figure 1 is a view in side elevation, partially 5 broken away, showingthe construction of the novel cover securing means herein disclosed;

Figure 2 is a plan view of Figure 1, partially broken away;

Figure 3 is a detail sectional view on the line 10 3--3 of Figure 2,showing one oi the'upright elements which operate to limit relativerotation of the cover upon the cooker body, and which also restricts itsupward movement with respect thereto; 15

Figure 4 is a view similar to Figure 3, but showing the cover unlocked,or in a position whereby it may readily be removed from the cooker body;

Figure 5 is a detail sectional plan view showing the arrangement of thecooperating means 20 on the cooker body and locking member to facilitatesecuring the cover to the cooker body;

Figure 6 is a detail plan view showing the cover in operative positionupon the cooker body;

Figure 'I is a similar view showing the cover 25 relatively rotated uponthe cooker body whereby it may be removed therefrom;

Figure 8 is a detail sectional view on the line 8--8 of Figure 2,showing the means for actuating the locking member to secure the coverto the 30 cooker body; and

Figure 9 is a detail sectional view on the line 9-9 of Figure 6, showing.the cover unseated to permit the escape of steamer pressure from theinterior of the-cooker. 35

In the selected embodiment of the invention here shown, there isillustrated in Figures 1 and 2,

a pressure cooker similar to thelone disclosed in my copendingapplication, Serial No. 647,576, filed December 16, 1932, and whichcomprises a 40 body portion 2, open at its upper end and provided withan annular tapered s'eat 3. The upper edge portion of the body 2 isshown turned outwardly toprovide, in effect, a flange 4 having outwardlyprojecting spaced lugs 5 provided on 45 its periphery, as clearlyillustrated in Figure 2. Suitable handles 6 are shown secured to thecooker body, whereby it may be conveniently moved aboutvfrom place toplace.

A cover 'I is shown having an annular tapered 50 flange 8 adapted toengage the seat 3 in the cooker body 2, as shown in Figure 1. The coverhas a Aplurality of outwardly projecting spaced lugs 9,

` :epesses levier intermediate portion of the cover, and

vwhich overlies the flange 4 of the cooker body when the cover is seatedthereon. The lugs 9 on the flange II of the cover are of substantiallythe same size asthe lugs Il on the cooker body, and are adapted tooverlie said lugs 5, as shown in Figures 2 and 5.

Means is provided whereby the cover 1 must be lifted to a. predeterminedposition, before it can be completely removed from the cooker body. Suchmeans is best shown in Figures 3 and 4, and comprises two or more pinsI2 secured to the flange II of the cover, and adapted to be received insuitable sockets I3 provided in the flange 4 of the cooker body. Whenthe cover is in sealing engagement with the seat 3 of the cooker body,the pins I2 will be received inthe sockets i 3, as shown in Figure 3.Studs I4 are secured to the flange 4 of the cooker body by suitablethreads I 5, and have offset heads I9 adapted to restrict relativeupward movement of the cover, when the pins I2 are positioned in thesockets I3, as shown in Figure 3, and the cover is released while underpressure.

It will thus be seen that when the cover is in the position shown inFigure 3, it cannot be relatively rotated upon the cooker body becauseof the pins I2 being received in the slots I3. The cover must thereforebe lifted to a position to movel the pins I2 out of the sockets I3,before it can be rotated to permit its removal from the cooker body.Relative upward movement of the cover is restricted by the heads I9 ofthe studs I4, which overhang the flange II of the ,cover when the latteris positioned as shown in Figure 3. 'I'he studs I4 are received inrecesses I'I in the flange II of the cover, and provide means forlimiting the relative rotary movement of the cover upon the cooker body,in the operation of securing it thereto or removing it therefrom.

The means for locking the cover J to the cooker body 'comprises anannular locking ring or member, generally indicated by the numeral I9,and shown constituted'of an upper horizontal web I9 and a vertical wallportion 29. The locking ring I9 fits over the flange II of the coverwith the inner edge of its web I9 substantially engaging the cylindricalportion 2| of the cover, whereby it is centered on said cover. Elongatedopenings 22 are provided in the web I9 of the ring I3 adapted to receivethe upper ends of the studs I4, as clearly illustrated in Figures 2 and3.

A plurality yof inwardly projecting lugs 23 are provided upon the loweredge of the vertical wall portion 20 of the ring I9, adapted to engagethe lugs 5 provided upon the periphery of the flange 4 of the cookerbody; as best shown in Figure 2. A plurality of screws 24 are mounted inthe upper flange I9 of the ring and are adapted to engage the flange IIof the cover to thereby force the latter into engagement with its seat3, as will readily be understood by reference to Figure 8. The lugs 23of the ring engage the bottom faces of the lugs 5 of the cooker body andthereby prevent upward movement of the ring I9, when the screws 24 arescrewed downwardly-into engagement with the flange II oi' the cover.

The ring is shown provided with suitable hand grips 25, whereby it maybe conveniently removed from the cover when it is desired to remove thelatter from the cooker body. In like manner, the cover 1 is providedwith suitable hand grips 29 whereby it may be conveniently handled whenplacing it upon or removing it from the cooker body. The cover is alsoshown provided with the usual pressure gauge 21. safety valve 219, andpressure release valve 29.

When the cover I is to be secured to the cooker body, it is seatedthereon, as shown in Figure 1, the studs I4 being received in therecesses I'I pro- 5 vided in the flange II of the cover, as shown inFigures 6 and 7. The cover is then relatively rotated upon the cookerbody from the position shown in Figure 7 to that shown in Figure v6,whereby the end walls 32 of the recesses I'I of 10 the cover will engagethe studs I4, as shown in Figure 6. When the cover is thus positioned,the pins I2 thereof will be received in the sockets I3 provided in theflange 4 of the cooker body,

whereby the tapered flange 9 of the cover will 15 move into sealingengagement with the seat 3 of the cooker body, as shownV in yFigures 1and 8. Thelocking ring I9 is then positioned upon the cover 1, ashereinbeforedescribed, and the screws 24 operated to secure the cover insealing engle- 20 ment with the seat 3, as will readily be understood byreference to Figures 3 and 8.

To remove the cover from the cooker body, the screws 24 are operated torelease the cover, whereupon the pressure within the cooker body, in245i the event that it hasnot been previously released by the operatorby manipulation of the valve 29, may force the cover upwardly againstthe heads I9 of the studs I4, as best shown in Figure 9, whereby thepressure in the cooker is 3o released before the cover can be completelyremovedtherefrcm. When the flange II of the cover is thus-engaged'withthe'heads I9 of the studs I4, the-pins I2 will be moved out of theirrespective sockets I3. as shown invFigure 3, where- 35 by the cover maybe relatively rotated in a counter-clockwise direction, or from theposition shown in Figure 3 to that shown in Figure 4, to thereby permitthe complete removal of the cover from the cooker body. Before the cover40 can again be moved into engagement with its seat 3, it must berelatively/rotated upon the l cooker body to move the pins l2 intoalinement with the sockets I3, as will readilybeunderstood by referenceto Figure 3. i 4

It is to be understood that when the cover is removed from the cookerbody, the locking ring I9, after having been released by actuation oithe screws 24, is removed from the cover and cooker. Tor-remove'thisring, it is relatively rotated upon 5o the flange II of the cover untilits lugs 23 register with the spaces provided between the lugs l of thecooker body and the lugs 9 on the cover, as shown in Figure 5, wherebythe ring may readily be removed from the apparatus. When the cover 55 isin sealing engagement with the seat 3 of the cooker body, its lugs 9 aresubstantially alined with the lugs 9 of the cooker body, as shown inFigures 2 and 5.

From the foregoing, it`will be seen that the co cover securing meansherein disclosed necessitates that the cover be lifted out of engagementwith its seat to a predetermined position before it can be relativelyrotated upon the cooker to l permit its complete removal therefrom,thereby es positively preventing the cover from accidentally being blownoff the cooker, should it aocidentlly be released while the cooker isunder pressure.

'I'he screws 24 for securing the cover 1 in sealing engagement with thecooker body are here shown 70 provided with square heads requiring theuse of a suitable instrument, such as a wrench for tightening them. Ifdesired, screws provided with suitable T-heads may be used in lieu ofthe screws 24, to thereby dispense with a separate wrench. 75

The order of the pins l2 and sockets I3 may also be reversed withoutdeparting from the scope of the invention.

I claim as my invention:

1. A pressure cooker comprising a body `having a seat therein and acover tting in said seat, outwardly projecting means on said body,outwardly projecting means on the cover overlying the correspondingmeans on said body, an annular one-piece locking member fitting over theoutwardly projecting means on the cover and having Ameans extendinginwardly and adapted to be positioned beneath the outwardly projectingmeans on the cooker body, and means movably mounted in said annularlocking member and cooperating therewith to force the closure intosealing engagement with said seat.

2. A pressure cooker comprising a body having a seat therein and a coverfitting in said seat, outwardly projecting means on said body, outwardlyprojecting means on the cover overlying the corresponding means on saidbody, an annular one-piece locking member tting over the voutwardlyprojecting means on the cover and having means engaging the outwardlyprojecting means on the cooker body, means movably mounted in saidlocking member for forcing the cover into sealing engagement with saidseat, means necessitating that the cover be relatively rotated upon saidbody before it can be moved into sealing.r engagement with its seat, andmeans whereby the cover must be unseated, before it can be relativelyrotated upon the cooker to permit its complete removal therefrom.

3. A pressure cooker comprising a body having a seat therein and a coverfitting in said seat, spaced radial lugs on the upper portion of saidbody, an annular locking member adapted to be supported upon the coverand having inwardly extending lugs positioned at an elevation below thelugs on the cooker body and adapted to be moved into vertical alinementtherewith to prevent relative upward movement thereof, when the cover issecured to its seat, means in said locking member for forcing the coveronto said seat, and means on the cover and cooker body necessitatingthat the cover be relatively rotated upon the cooker body before it canbe seated, and whereby it must be lifted from its seat before it can berelatively rotated to permit its complete removal from the cooker body.

4. A pressure cooker comprising a body having a seat therein and a coverfitting in said seat, spaced radial lugs on the upper portion of saidbody, a detachable annular locking member adapted to be supported uponthe cover and having inwardly extending lugs positioned at an elevationbelow the lugs on the cooker body, said cover ,being adapted for limitedrotation to move its lugs into vertical alinement with the lugs on thecooker body, thereby to prevent relative upward movement thereof whenthe cover is secured to its seat, means in said locking member forforcing the cover onto said seat, and means on the cover and cooker bodynecessitating that the cover be relatively rotated upon the cookerbefore it can be seated, and whereby it must be lifted vfrom its seatbefore it can be relatively rotated to elevation below the lugs on thecookerbody, means on the cooker body permitting limited rotation of saidlocking member relatively to said cooker body and cover, and whereby thelugs on said member may be moved into vertical aliner, ment with thelugs on the cooker body to prevent relative upward movement thereof whenthe cover is secured to its seat, and means carried by the lockingmember for forcing the cover onto said seat. 6. A pressure cookercomprising a body having a seat therein and a cover fitting in saidseat, a plurality of spaced radial lugs on the upper portion of saidbody, an outwardly turned flange on the cover, an annular locking memberadapted to be seated on said ange and having inwardly extending lugsadapted to engage the bottom faces oi. the lugs on l,the cooker body,means whereby said locking member may be relatively rotated to move itslugs into alinement with the .o lugs on the cooker body, and threadedmeans in said locking member adapted to engage the `flange on said coverto thereby force the cover into sealing engagement with its seat, whenthe lugs on the locking member are operatively en- 2 gaged with the lugson the cooker body.

7. A pressure cooker comprising a body having a seat therein and a coverfitting in said seat, a plurality of spaced radial lugs on the upperportion of said body, an outwardly turned :zo flange on the cover, anannular locking member adapted to be seated on said flange and havinginwardly extending lugs adapted to engage the bottom faces of the lugson the cooker body. means whereby said locking member may be rels.,atively rotated to move its lugs into alinement with the lugs on thecooker body, and threaded means movably mounted on the locking memberand adapted to force the cover into sealing engagement with said seat,when the lugs on the 4e locking member are alined with the lugs on thecooker body.

8. A pressure cooker comprising a body having a seat therein and a coverfitting in said seat, a plurality of spaced radial lugs on the upperportion of said body, an outwardly turned flange on the cover, anannular locking member adapted to be seated on said flange and havinginwardly extending lugs adapted to engage the bottom Cil faces of thelugs on the cooker body, means whereby said locking member may berelatively rotated to move its lugs into alinement with the lugs on thecooker body, threaded means in said locking member adapted to engage theflange on said cover to thereby force the cover into sealing engagementwith its seat, when the lugs on the locking member are operativelyengaged with the lugs on the cooker body, and means on the cover andcooker body necessitating that the cover be relatively rotated upon thecooker body before it can be seated, and whereby it must be lifted fromits seat to a predetermined position before it can be relatively rotatedto permit its complete removal from the cooker body.

9. A pressure cooker comprising a body havo5 ing a seat therein andprovided at its upper end with a plurality of outwardly extendingprojections, a cover adapted to be fitted onto said seat and having aplurality of outwardly extending projections thereon alined with theprojections on the cooker body when the cover is secured to said seat, aclamping member seated on the cover and having means engageable with theprojections on the cooker body for holding the cover on the seat, andmeans necessitating that the cover 7l be lifted from its seat to apredetermined position before it can be completelyremoved from thecooker body. Y A

10. A pressure cooker comprising a body having .outwardly projectingspaced means at its upper portion, a'cover for said body havingoutwardly projecting spaced means on its periphery adapted to be movedinto registration with the outwardly projecting means on the cookerbody, means secured to the cooker body for limiting relative rotary andupward movements of the cover, a detachable clamping member for securingthe cover to said body, and means necessitating that the cover be movedout of sealing vengagement with the cooker body before it can berelatively rotated to permit its complete removal from the cooker body.

t 11. A pressure coo-ker comprising a body having an upper edge and a.seat adjacent thereto, a cover having means adapted to engage said seatand provided with outwardly extending means, an upright element on theupper edge of the cooker body having an oiset head, vsaid elementlimiting rotary movement of the cover on the cooker body, means forsecuring the cover to vsaid seat, and said element also restrictingrelative upward movement oi the cover should said securing means beactuated to release said cover,

while the cooker is under pressure.

l2. A pressure cooker comprising a body having an upper edge and a seatadjacent thereto, a

cover having means adapted to engage said seat and provided withoutwardly extending means. an upright element on the upper edge of thecooker body having an offset head, said element being adapted to beengaged by the cover and thereby limit relative rotary movement of said`cover on the cooker body, an annular locking member seated on the coverand having an opening therein to receive said element, and wherebyrotary movement of said locking member is restricted. and meanscooperating with said locking member to secure the cover to the cookerbody.

13. A pressure cooker comprising a body havlng an upper edge and a seatadjacent thereto, a cover having means adapted to engage said seat andprovided with outwardly extending means, an upright element on the upperedge of the cooker body having an offset head, said element beingadapted to be engaged by the cover and thereby limit relative rotarymovement of said cover on the cooker body, an annular locking memberseated on the cover and having an opening therein to receive saidelement, and 5 ing a seat therein. a cover removably fitting said seat,an annular clamping ring adapted to be fitted over the outer marginaledge portion of said cover and having a portion extending downwardlytherefrom, means on the cooker body adapted to be engaged by saiddownwardly extending portion, and means on the clamping ring for forcingthe cover into engagement with said seat in leak-proof fashion.

15. A pressure cooker comprising a body having a seat therein. a coverremovably ntting said seat. an annular clamping ring adapted to befitted over the outer marginal edge portion of said cover and having aportion extending downwardly therefrom, means for axially alining saidclamping ring with the cover, means on the rcooker body adapted to beengaged by the downwardly extending portion of said ring for locking thecover to the cooker body. and means on 35 CARL NELSON.

vment with its seat.

